<%--
  Created by IntelliJ IDEA.
  User: lenovo
  Date: 2018/4/26
  Time: 20:53
  To change this template use File | Settings | File Templates.
--%>
<%@ page contentType="text/html;charset=UTF-8" language="java" %>
<html>
<head>
    <title>Title</title>
</head>
<body>
<%
    int number= Integer.parseInt(request.getParameter("number"));
    int sum=0;
    for (int i=1;i<=number;i++){
        sum=sum+i;
    }
    out.write(sum);
%>

</body>
</html>
